Revert "mach: prevent disabling uart clock"

This reverts commit 641e63b22a2e6697f1a2acc96c5264db66e3ea4d.

Signed-off-by: David Rodero <david@codiguiel.net>
Revert "mach: prevent UART3 from being disabled by the hwmod"

This reverts commit fc40e813396bd809264baa525946da638f073f11.

Signed-off-by: David Rodero <david@codiguiel.net>

Conflicts:
	arch/arm/mach-omap2/serial.c